Heterostructure of Si and CoSe2: A Promising Photocathode Based on a Non‐noble Metal Catalyst for Photoelectrochemical Hydrogen Evolution |
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| Authors: | Dr Mrinmoyee Basu Zhi‐Wei Zhang Chih‐Jung Chen Po‐Tzu Chen Kai‐Chih Yang Prof Chong‐Geng Ma Dr Chun Che Lin Prof?Dr Shu‐Fen Hu Prof?Dr Ru‐Shi Liu |
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| Institution: | 1. Department of Chemistry, National Taiwan University, Taipei 106 (Taiwan);2. Department of Physics, National Taiwan Normal University, Taipei 116 (Taiwan);3. College of Sciences, Chongqing University of Posts and Telecommunications, Chongqing 400065 (P.R. China);4. Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 106 (Taiwan) |
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| Abstract: | Development of a solar water splitting device requires design of a low‐cost, efficient, and non‐noble metal compound as alternative to noble metals. For the first time, we showed that CoSe2 can function as co‐catalyst in phototoelectrochemical hydrogen production. We designed a heterostructure of p‐Si and marcasite‐type CoSe2 for solar‐driven hydrogen production. CoSe2 successively coupled with p‐Si can act as a superior photocathode in the solar‐driven water splitting reaction. Photocurrents up to 9 mA cm?2 were achieved at 0 V vs. reversible hydrogen electrode. Electrochemical impedance spectroscopy showed that the high photocurrents can be attributed to low charge transfer resistance between the Si and CoSe2 interfaces and that between the CoSe2 and electrolyte interfaces. Our results suggest that this CoSe2 is a promising alternative co‐catalyst for hydrogen evolution. |
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| Keywords: | cobalt selenide hydrogen evolution nanorods semi‐metals water splitting |
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